1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.android.messaging.ui;
17
18import android.content.ClipData;
19import android.content.ClipboardManager;
20import android.content.Context;
21import android.util.AttributeSet;
22import android.widget.EditText;
23
24/**
25 * We want the EditText used in Conversations to convert text to plain text on paste.  This
26 * conversion would happen anyway on send, so without this class it could appear to the user
27 * that we would send e.g. bold or italic formatting, but in the sent message it would just be
28 * plain text.
29 */
30public class PlainTextEditText extends EditText {
31    private static final char OBJECT_UNICODE = '\uFFFC';
32
33    public PlainTextEditText(final Context context, final AttributeSet attrs) {
34        super(context, attrs);
35    }
36
37    // Intercept and modify the paste event. Let everything else through unchanged.
38    @Override
39    public boolean onTextContextMenuItem(final int id) {
40        if (id == android.R.id.paste) {
41            // We can use this to know where the text position was originally before we pasted
42            final int selectionStartPrePaste = getSelectionStart();
43
44            // Let the EditText's normal paste routine fire, then modify the content after.
45            // This is simpler than re-implementing the paste logic, which we'd have to do
46            // if we want to get the text from the clipboard ourselves and then modify it.
47
48            final boolean result = super.onTextContextMenuItem(id);
49            CharSequence text = getText();
50            int selectionStart = getSelectionStart();
51            int selectionEnd = getSelectionEnd();
52
53            // There is an option in the Chrome mobile app to copy image; however, instead of the
54            // image in the form of the uri, Chrome gives us the html source for the image, which
55            // the platform paste code turns into the unicode object character. The below section
56            // of code looks for that edge case and replaces it with the url for the image.
57            final int startIndex = selectionStart - 1;
58            final int pasteStringLength = selectionStart - selectionStartPrePaste;
59            // Only going to handle the case where the pasted object is the image
60            if (pasteStringLength == 1 && text.charAt(startIndex) == OBJECT_UNICODE) {
61                final ClipboardManager clipboard =
62                        (ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE);
63                final ClipData clip = clipboard.getPrimaryClip();
64                if (clip != null) {
65                    ClipData.Item item = clip.getItemAt(0);
66                    StringBuilder sb = new StringBuilder(text);
67                    final String url = item.getText().toString();
68                    sb.replace(selectionStartPrePaste, selectionStart, url);
69                    text = sb.toString();
70                    selectionStart = selectionStartPrePaste + url.length();
71                    selectionEnd = selectionStart;
72                }
73            }
74
75            // This removes the formatting due to the conversion to string.
76            setText(text.toString(), BufferType.EDITABLE);
77
78            // Restore the cursor selection state.
79            setSelection(selectionStart, selectionEnd);
80            return result;
81        } else {
82            return super.onTextContextMenuItem(id);
83        }
84    }
85}
86